Proving the Pythagorean Theorem
This is a way to prove a triangle is a right triangle using geometry. It is just one of the ways you can prove the Pythagorean Theorem. It involves the use of squares being lined up with the sides of the triangles.

The Converse of the Pythagorean Theorem
You can also prove the pythagorean Theorem by using the equation and solving using algebra. You can see below two proofs on how to use algebra to prove if a triangle is a right triangle. The biggest thing to remember is that the longest side will be the "c."



A chance for some practice on the converse
You see some examples to the right. Work them out on paper, and then see if you are correct.

